even russia, syria's most powerful ally, is alarmed. their foreign minister met yesterday with secretary clinton, discussing the possibility of a syria without assad in power. this morning, rebels have declared damascus's airport a military target, warning civilians and airlines not to approach it. >>> and in egypt, tanks and barbed wire barricades returned to the streets of cairo as deadly protests raged outside the presidential palace. egyptian president mohamed morsi is calling for a national dialogue but is resolute about his controversial constitution. nbc's ayman mohyeldin is joining us live from cairo monitoring the situation. let's start with egypt. how much more trouble is morsi in there? >> reporter: well, he's definitely politically isolated because all of egypt's major political factions have really come out against him for both the constitutional decree that gave him absolute powers nearly two weeks ago and kicked off all of these protests, but more importantly, they're very upset with him that he's trying to ram home this